Sildenafil citrate, sold as Viagra, Revatio and under different other have dealings names, is a drug used to premium erectile dysfunction and pulmonary arterial hypertension (PAH). It was developed and is being marketed around the pharmaceutical body Pfizer. It acts on inhibiting cGMP associated with phosphodiesterase classification 5, an enzyme that regulates blood flow in the penis. Since becoming readily obtainable in 1998, sildenafil has been the prime treatment an eye to erectile dysfunction; its initial competitors on the customer base are tadalafil (Cialis) and vardenafil (Levitra).
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